The default loggins is already piped to stdout, but if you want a clean one
go for it:

var kenny = loggins();

loggins.pipe(fs.createWriteStream('./log.log'));

It takes an optional arguments hash with values:

opts.levels: Either a list of levels, or key-value pairs of the form
<level>: <color>.

This returns a stream which outputs pretty-printed logging events.

logger will have a method for every level. For example:

logger.info('this is some info');

logger.info is also a readable/writable stream. As a writable stream, it will
log each chunk as a logging message. As a readable stream, it just emits the
log messages.

logger.raw is the same as 'logger' except the chunks are in JSON format.

logger._pretty is used to format an object with the keys "level" and
"message". You can punch this to customize what prettiness looks like. By
default colorizes the message if logger.colors[level] is defined, using some
copypasta from the colors library to avoid punching the prototype
(looking for a better solution!!!).